The Ministry of the Environment website that informs people the risk of heat stroke, through its Heat Stroke Prevention Information Site”, found that the indication of the “heat index” color-coded on the map was difficult to distinguish for people with color vision disorders, and it was decided to review the color scheme. According to the Ministry of the Environment, it is said that there are more than 3 million people who are in congenitally different colors in appearance in the domestic market, according to the Ministry of the Environment, the highest “danger (red)” and the second “severe vigilance Orange) “, the fourth” attention (green) “looks the same.

If the heat index exceeds “severe vigilance”, it is known that heat stroke patients increase significantly, there is a possibility of causing serious mistakes in confusion.